The SIG M18 is the compact variant of the US Modular Handgun System, adopted by the US Navy, Air Force, and Marine Corps as their standard service pistol. Its modular design, featuring interchangeable grip modules, allows for a wide range of hand sizes. The M18 is built around a removable, serialized Fire Control Unit (FCU), enabling easy customization and maintenance. Military-contract overruns are available to civilians, offering identical pistols to those issued to service members.
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